Omid Farivar, a researcher, who works for the site, got in touch with Isis, tweeting: "sorry about this. I don't know what happened. I've reported it to the right people and we're working on fixing it."

Following the incident, Isis who works as an engineer for a San Francisco firm, called for Islamic State to be referred to as Daesh -- a term widely used in Arab countries to refer to the militant group.